I've read on the Internet Movie Database, that Ike Eisenmann, the guy who played as Tony in Escape to/Return From Witch Mountain, had a guest appearence as a member of the Ku Klux Klan in one episode. I suppose most parents who took their kids to see either of those films would be surprised at this, but still, which episode was the one that had Tony as a KKK member?

It was the episode where Florence and Louise took CPR and there were 2 clansmen there. Tom got mixed up and thought a KKK meeting was something about all the robbing going around in the building. So George went too. In the end, George gives the KKK member CPR after he has a heart attack.

The episode is titled "Sorry Wrong Meeting" #149 on N@N's episode guide.